Kev tshawb fawb ntawm subharmonic oscillation nyob rau hauv ncov tam sim no hom ntawm switching fais fab mov
DC-DC hloov hluav taws xob hloov hluav taws xob tau siv dav hauv cov khoom siv hluav taws xob, khoom siv hluav taws xob, thiab cov khoom siv hauv tsev vim nws qhov zoo ntawm qhov me me, lub teeb yuag, kev ua haujlwm siab, thiab kev ua haujlwm ruaj khov, nkag mus rau lub sijhawm ntawm kev loj hlob sai. DC-DC hloov hluav taws xob siv hluav taws xob siv hluav taws xob siv hluav taws xob ua cov hloov pauv thiab kho cov zis hluav taws xob los ntawm kev tswj hwm lub luag haujlwm ntawm cov keyboards. Cov tswj Circuit Court topology muab faib ua hom tam sim no thiab voltage hom. Tam sim no hom tswj tau dav siv vim nws qhov zoo xws li cov lus teb ceev ceev, yooj yim them nyiaj Circuit Court, loj nce bandwidth, me me tso zis inductance, thiab yooj yim tam sim no sib koom. Tam sim no hom tswj tau muab faib ntxiv rau hauv kev tswj hwm tam sim no thiab nruab nrab tam sim no tswj. Qhov zoo ntawm lub ncov tam sim no yog: 1) ceev nrawm kaw-voj teb, nrog rau cov lus teb nrawm nrawm rau kev hloov pauv ntawm cov khoom siv hluav taws xob thiab cov khoom tso tawm; 2) Lub voj tswj tau yooj yim tsim; 3) Nruab nrog yooj yim thiab tsis siv neeg sib nqus sib npaug muaj nuj nqi; 4) Nruab nrog instantaneous ncov tam sim no limiting muaj nuj nqi, thiab lwm yam. Txawm li cas los, ncov inductance tam sim no yuav ua rau subharmonic oscillations nyob rau hauv lub system. Txawm hais tias muaj ntau cov ntaub ntawv tau qhia txog qhov no rau qee qhov, tsis muaj kev tshawb fawb txog kev ua haujlwm subharmonic oscillations, tshwj xeeb tshaj yog lawv cov laj thawj thiab kev siv hluav taws xob tshwj xeeb. Kab lus no yuav ua txoj kev tshawb fawb txog kev ua haujlwm subharmonic oscillations.
Ua rau 1st harmonic oscillation
Noj PWM modulation ncov tam sim no hom hloov fais fab mov raws li ib qho piv txwv (raws li qhia hauv daim duab 1, thiab muab ib tug nqes nqes them nqi qauv), ib tug ncauj lus kom ntxaws tsom xam yog ua los ntawm txawv kev xam pom ntawm qhov ua rau ntawm subharmonic oscillation.
Rau tam sim no inner voj tswj hom, Daim duab 2 qhia qhov inductance tam sim no hloov thaum lub sij hawm lub luag hauj lwm lub voj voog yog ntau tshaj 50 feem pua thiab cov inductance tam sim no undergoes ib tug me me kauj ruam Δ, qhov twg cov khoom kab sawv cev rau inductance tam sim no waveform thaum lub sij hawm ib txwm ua hauj lwm system, thiab cov kab dashed sawv cev rau qhov tseeb ua haujlwm waveform ntawm inductance tam sim no. Nws tuaj yeem pom tias: 1) inductance tam sim no yuam kev ntawm lub voj voog tom kawg yog ntau dua qhov inductance tam sim no yuam kev ntawm lub voj voog dhau los, uas yog, inductance tam sim no yuam kev teeb liab oscillates thiab diverges, thiab lub kaw lus tsis ruaj khov; 2) Lub sijhawm oscillation yog ob zaug lub sijhawm hloov, uas yog, qhov zaus oscillation yog 1/2 ntawm qhov hloov zaus, uas yog lub hauv paus ntawm lub npe subharmonic oscillation. Daim duab 3 qhia txog qhov sib txawv ntawm inductance tam sim no thaum lub voj voog lub cev muaj zog ntau dua 50 feem pua thiab muaj cov kauj ruam me me AD hauv lub voj voog ua haujlwm, qhia tias lub kaw lus tseem yuav muaj kev cuam tshuam subharmonic oscillation. Thaum lub voj voog lub luag haujlwm tsawg dua 50 feem pua, txawm hais tias muaj kev cuam tshuam hauv inductance tam sim no lossis lub luag haujlwm lub voj voog tuaj yeem ua rau oscillation nyob rau hauv inductance tam sim no yuam kev teeb liab, qhov oscillation no belongs rau attenuation oscillation. Lub kaw lus ruaj khov.
